Engine oil composition

Abstract

The invention discloses an engine oil composition. According to an embodiment of the present invention, the engine oil composition comprises: an engine oil complexing agent; a viscosity index improver; a dispersive pour point depressant; a co-emulsifier; and base oil. The engine oil composition provided by the embodiment of the invention has excellent emulsification and icing resistance.

Description

Technical Field

[0001] The present invention belongs to the field of engine oil compositions, and in particular, relates to an engine oil composition, and more particularly, to a method for preparing the engine oil composition, an engine and a car. Background Art

[0002] With the continuous advancement of automobile technology, hybrid vehicles are increasingly favored by the market due to their excellent energy-saving and environmental protection characteristics. However, compared with traditional vehicles, the engine operating mode of hybrid vehicles is more complex and changeable, especially during frequent start-stop and power switching, the engine faces more stringent working conditions, which puts higher standards on the performance of engine oil.

[0003] The engines of hybrid vehicles are usually small, efficient and have high compression ratios. In addition, the deep involvement of the motor makes the engine's operating conditions change much more during frequent starts and stops than traditional fuel vehicles. Especially in winter, the mixture of oil, water and gasoline in the oil pan will freeze, blocking the oil pump, causing the engine to fail to start or serious faults such as cylinder scuffing, thus affecting the normal operation of the vehicle.

[0004] Therefore, there is an urgent need to develop a new type of engine oil composition to cope with the icing problem caused by a large amount of water and fuel mixed in the engine oil of hybrid vehicles in severe cold environments, as well as the resulting engine start failure and other faults, to ensure the reliability and performance of the vehicle under extreme climatic conditions. Summary of the invention

[0005] The present invention aims to solve at least one of the technical problems existing in the prior art to a certain extent. To this end, the present invention provides an engine oil composition.

[0006] The present invention is accomplished based on the following findings of the inventors:

[0007] In the cold winter in the north, the temperature can drop to minus 30 to minus 20 degrees Celsius. This frequent start-stop condition easily causes a large amount of water and gasoline to mix into the engine oil, and the proportion is sometimes as high as 20%. In this case, the mixture of oil, water and gasoline in the oil pan may freeze, blocking the oil pump, causing the engine to fail to start or serious faults such as cylinder pulling, thereby affecting the normal operation of the car. In order to overcome this problem, the inventor added a dispersing pour point depressant and an emulsifier to the engine oil compound, so that the engine oil has excellent emulsification and anti-icing properties without affecting other properties of the engine oil, ensuring the normal start of the engine in a low temperature environment.

[0008] In the first aspect of the present invention, the present invention provides an engine oil composition. According to an embodiment of the present invention, the engine oil composition comprises: an engine oil compound; a viscosity index improver; a dispersant pour point depressant; an emulsifier; and a base oil. The engine oil composition according to the embodiment of the present invention has excellent emulsification and anti-icing properties.

[0009] In a second aspect of the present invention, the present invention provides a method for preparing an engine oil composition. According to an embodiment of the present invention, the method comprises: mixing a dispersible pour point depressant, a viscosity index improver, an engine oil compound, an emulsifier, and a base oil to obtain an engine oil composition. According to the method of the embodiment of the present invention, an engine oil composition with excellent emulsification and anti-icing properties can be prepared.

[0010] In a third aspect of the present invention, the present invention provides an engine. According to an embodiment of the present invention, the engine comprises: the engine oil composition according to the first aspect of the present invention.

[0011] In a fourth aspect of the present invention, the present invention provides an automobile. According to an embodiment of the present invention, the automobile comprises: the engine oil composition according to the first aspect of the present invention.

[0012] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0014] Figure 1 This is a graph showing the emulsification retention of the engine oil composition according to the embodiment of the present application after being placed at room temperature for 14 days ( Figure 1 From left to right are the results of emulsification retention of engine oil compositions prepared by DS1, S2, S6 and S7 after being stored at room temperature for 14 days). DETAILED DESCRIPTION

[0015] The embodiments of the present application are described in detail below. Examples of the embodiments are shown in the drawings, but unnecessary detailed descriptions may be omitted. For example, detailed descriptions of well-known matters and repeated descriptions of actually identical structures may be omitted. This is to avoid the following description from becoming unnecessarily lengthy and to facilitate understanding by those skilled in the art. In addition, the drawings and the following description are provided for those skilled in the art to fully understand the present application and are not intended to limit the subject matter described in the claims.

[0016] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as those commonly understood by technicians in the technical field to which this application belongs; the terms used in this application are only for the purpose of describing specific embodiments and are not intended to limit this application; unless otherwise specified, the numerical values ​​of the parameters mentioned in this application can be measured using various measurement methods commonly used in the art (for example, they can be tested according to the methods given in the embodiments of this application).

[0017] The terms "including" and "having" in the specification and claims of the present application and any modifications thereof are open expressions, that is, including the contents specified in the present application but not excluding other contents.

[0018] In the description of the present application, it should be understood that the terms "width", "thickness", etc. indicate orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0019] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. "First feature" and "second feature" may include one or more of the features.

[0020] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0021] In the description of the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0022] In the description of the present application, “plurality” means two or more.

[0023] In the description of the present application, "A and / or B" may include the case of A alone, the case of B alone, or any of the cases of A and B, where A and B are only used for examples and may be any technical feature connected by "and / or" in the present application.

[0024] In the description of this application, the term "dispersible pour point depressant" refers to a special additive that has dispersing properties in addition to improving the low-temperature fluidity of petroleum products such as lubricating oils and fuel oils. They prevent the formation and aggregation of wax crystals by lowering the freezing point and cold filter point of oil products, thereby maintaining the fluidity of oil products under low temperature conditions. These pour point depressants usually contain polymers or condensates, and the molecular structure contains both polar groups and parts similar to the alkyl chain structure of paraffin hydrocarbons, which can effectively disperse wax crystals at low temperatures and prevent them from forming a three-dimensional network structure, thereby blocking the flow of oil products. In the production of lubricating oils and fuel oils, the application of dispersible pour point depressants is particularly important. For example, diesel pour point depressants can significantly reduce the freezing point of diesel, so that diesel still maintains good fluidity at low temperatures, which is crucial for equipment using diesel engines in cold areas. In addition, this type of pour point depressant also has good antioxidant and corrosion resistance, which can protect the engine from high-temperature oxidation and corrosion.

[0025] In the description of this application, the term "non-dispersive pour point depressant" refers to those pour point depressants that do not rely on dispersion to reduce the freezing point of oil products. This type of pour point depressant changes the size and shape of wax crystals and prevents wax crystals from forming a three-dimensional spatial network structure, thereby enhancing the low-temperature fluidity of oil products. They do not directly disperse wax crystals, but work by changing the growth mode of wax crystals. The mechanism of action of non-dispersive pour point depressants mainly includes the following points: 1. Nucleation effect: non-dispersive pour point depressants form crystal nuclei in oil products, becoming the center of wax crystal development, increasing wax crystals, and not easy to form large wax clusters; 2. Adsorption effect: non-dispersive pour point depressants adsorb on wax crystal nuclei, change the orientation of wax crystals, and reduce the adhesion between wax crystals; 3. Eutectic effect: non-dispersive pour point depressants precipitate together with wax, change the crystallization behavior and orientation of wax, and weaken the trend of wax crystals to continue to develop. In practical applications, non-dispersive pour point depressants can be used in various lubricating oils, fuel oils, etc. to improve their low-temperature flow properties. For example, diesel pour point depressant can significantly reduce the freezing point of diesel, allowing diesel to maintain good fluidity at low temperatures, which is especially important for equipment using diesel engines in cold areas.

[0026] In the description of this application, the term "engine oil composition" is a mixture of various additives and base oils to improve the performance of engine lubricants. These additives include, but are not limited to, detergents, dispersants, antioxidants and anticorrosives, antiwear agents, viscosity index improvers, pour point depressants, friction modifiers, etc. They work together to reduce engine wear, improve fuel efficiency, clean the inside of the engine, prevent the formation of sludge and carbon deposits, and maintain good fluidity at different temperatures. When preparing an engine oil composition, the ratio and quality of the additives are very important because they directly affect the performance of the oil. For example, detergents and dispersants help prevent the formation of carbon deposits and sludge, while antioxidants and anticorrosives help extend the service life of the oil. Viscosity index improvers are used to increase the viscosity index of the oil to ensure that proper lubrication can be provided at different temperatures. The preparation method of the engine oil composition generally includes mixing the base oil and various additives at a certain temperature to ensure full uniformity. In addition, the type and proportion of additives can be adjusted according to specific application requirements to achieve the desired performance.

[0027] In the description of this application, the term "engine oil compound" refers to a class of additives used in engine lubricating oils, which are a combination of chemical substances with specific functions. These compounds can improve the performance of lubricating oils, providing multiple effects such as anti-wear, anti-oxidation, anti-foaming, cleaning, dispersing, and rust prevention. They are composed of a variety of chemical components, including but not limited to base oils, antioxidants, detergents, dispersants, extreme pressure additives, etc., and sometimes contain metal powders or other special ingredients to enhance performance.

[0028] The invention provides an engine oil composition, a method for preparing the engine oil composition, an engine and a vehicle.

[0029] Engine oil composition

[0030] In the first aspect of the present invention, the present invention provides an engine oil composition. According to an embodiment of the present invention, the engine oil composition comprises: an engine oil compound; a viscosity index improver; a dispersant pour point depressant; an emulsifier; and a base oil. The engine oil composition according to the embodiment of the present invention has excellent emulsification and anti-icing properties, and can ensure normal engine starting in a low temperature environment.

[0031] According to an embodiment of the present invention, the engine oil compound comprises at least one of Afton H11458, Afton H11181, Afton H11410, Infineum P5960 and Infineum P6800.

[0032] According to an embodiment of the present invention, the engine oil compound is an engine oil compound that meets API SP specifications or ACEA C5 / C6 / C7 specifications.

[0033] According to an embodiment of the present invention, API SP is the latest gasoline engine oil performance specification, which is formulated by the American Petroleum Institute (API) and represents a new specification for engine oil. This specification was officially released on May 1, 2020, and is designed to meet the needs of modern high-performance vehicles and engines, such as turbocharging, direct injection and other technologies. API SP grade engine oil has excellent performance in low viscosity, high cleanliness, high oil film strength and good anti-wear ability, and needs to meet strict emission regulations to reduce the impact on the environment. API SP is an upgraded version after API SN and API SN PLUS, providing better engine protection and performance while maintaining fuel economy.

[0034] According to an embodiment of the present invention, the ACEA C series is a motor oil performance standard formulated by the European Automobile Manufacturers Association (ACEA), wherein C5, C6 and C7 are motor oil specifications for gasoline and light diesel engines with exhaust aftertreatment devices. ACEA C6 / C7 is the latest standard, which adds tests for low speed pre-ignition (LSPI), chain wear and turbocharger deposits on the basis of C5, requiring the motor oil to provide better protection in these aspects. The motor oil of the C6 / C7 standard has been improved in preventing low speed pre-ignition, chain wear, turbine anti-deposition and fuel economy, and is suitable for modern engines equipped with particulate traps.

[0035] Engine oil compounding agents are additives used to prepare engine oils. They usually contain detergents, dispersants, antioxidants, anti-corrosion agents, anti-friction agents, etc., and are used to improve the performance of oil products, including high-temperature detergency, low-temperature dispersibility, antioxidants, and anti-wear properties. For example, the engine oil compounding agent KT 31160 produced by Kangtai Co., Ltd. is compounded with high-quality detergents, high-molecular ashless dispersants, anti-friction agents, and composite antioxidants, which can meet the performance level requirements of API CI-4 / SL and CH-4 / SL, and is suitable for Class II oils, Class III oils, and synthetic oils.

[0036] According to an embodiment of the present invention, the engine oil compound can be selected from at least one of Afton Chemical's Afton H11458, Afton H11181, Afton H11410, Infineum P5960 and Infineum P6800.

[0037] According to an embodiment of the present invention, the viscosity index improver includes at least one of an ethylene propylene copolymer and a hydrogenated styrene diene copolymer.

[0038] According to an embodiment of the present invention, the viscosity index improver may be selected from at least one of Afton Chemical H5748, Lubrizol LZ 7077 and Infineum SV261.

[0039] According to an embodiment of the present invention, the dispersible pour point depressant has a general chemical formula as shown in formula (1):

[0040]

[0041] Among them, R1 is C1~C 20 The straight or branched hydrocarbon group, R2 is hydrogen or methyl, Y is a polar group, m is in the range of 1 to 70, n is in the range of 1 to 125, and the molecular weight is 10000 to 200000. According to the embodiment of the present invention, the present invention optimizes the specific selection and proportion of the dispersible pour point depressant, and selects a pour point depressant with a dispersing function, which can effectively enhance the emulsification retention of the engine oil, allowing water to be evenly dispersed and emulsified in the engine oil to form an "oil-in-water" emulsion system, so it is not easy to be frozen at low temperatures.

[0042] According to an embodiment of the present invention, the dispersible pour point depressant may be dispersible DPMA polymethyl methacrylate.

[0043] According to an embodiment of the present invention, R1 is C6~C 18 A straight-chain or branched hydrocarbon group.

[0044] According to an embodiment of the present invention, more preferably, R1 is C 12 ~C 16 A straight-chain or branched hydrocarbon group.

[0045] According to an embodiment of the present invention, the polar group Y contains at least one of nitrogen or oxygen elements.

[0046] According to an embodiment of the present invention, more preferably, the molecular weight of the dispersible pour point depressant is 20,000 to 150,000.

[0047] According to an embodiment of the present invention, the content of the dispersible pour point depressant may be, but is not limited to, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, or 0.8 parts.

[0048] According to an embodiment of the present invention, the co-emulsifier has a general chemical formula as shown in formula (2):

[0049]

[0050] Where R is C 12 ~C 20 The straight or branched hydrocarbon group. According to the embodiment of the present invention, the addition of the co-emulsifier can further enhance its emulsification performance and improve its low-temperature freezing. The addition of the two does not affect other properties of the engine oil. The engine oil composition prepared by the present invention can effectively improve the low-temperature performance index of the obtained oil product in addition to improving the anti-icing and emulsification properties, and has excellent comprehensive performance.

[0051] According to an embodiment of the present invention, more preferably, R is C 16 ~C 18 A straight-chain or branched hydrocarbon group.

[0052] According to an embodiment of the present invention, the content of the co-emulsifier may be, but is not limited to, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, or 0.8 parts.

[0053] According to an embodiment of the present invention, the auxiliary emulsifier may be selected such as HD 32K from Evonik.

[0054] According to an embodiment of the present invention, the base oil includes at least one of a Group III base oil and a Group IV base oil.

[0055] According to an embodiment of the present invention, the kinematic viscosity of the base oil at 100°C is 3 to 10 mm 2 / s, for example, 3mm 2 / s, 4mm 2 / s, 5mm 2 / s, 6mm 2 / s、7mm 2 / s, 8mm 2 / s, 9mm 2 / s, 10mm 2 / s or a range between 4 to 10 mm 2 / s, 5 to 10 mm 2 / s and 6 to 10mm2 / s.

[0056] According to an embodiment of the present invention, based on the total weight of the engine oil composition, the engine oil composition comprises:

[0057] 7-13 parts of engine oil compound;

[0058] 1 to 10 parts of viscosity index improver;

[0059] 0.2-0.8 parts of dispersible pour point depressant;

[0060] 0.2-0.8 parts of auxiliary emulsifier;

[0061] 75.4 to 91.6 parts of base oil.

[0062] According to an embodiment of the present invention, the content of the engine oil compound may be, but is not limited to, 7, 7.5, 8, 8.5, 9, 9.5, 10, 10.5, 11, 11.5, 12, 12.5, or 13 parts.

[0063] According to embodiments of the present invention, the content of the viscosity index improver may be, but is not limited to, 1, 1.5, 2, 2.5, 3, 3.5, 4, 4.5, 5, 5.5, 6, 6.5, 7, 7.5, 8, 8.5, 9, 9.5, or 10 parts.

[0064] According to an embodiment of the present invention, the content of the dispersible pour point depressant may be, but is not limited to, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, or 0.8 parts.

[0065] According to an embodiment of the present invention, the content of the co-emulsifier may be, but is not limited to, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, or 0.8 parts.

[0066] According to an embodiment of the present invention, the content of the base oil may be, but is not limited to, 75.4, 77.4, 79.4, 81.4, 83.4, 85.4, 87.4, 89.4, 91.4, or 91.6 parts.

[0067] Method for preparing engine oil composition

[0068] In the second aspect of the present invention, the present invention proposes a method for preparing an engine oil composition. According to an embodiment of the present invention, the method comprises: mixing a dispersible pour point depressant, a viscosity index improver, an engine oil compound, an emulsifier, and a base oil to obtain an engine oil composition. According to an embodiment of the present invention, the dispersible pour point depressant, the viscosity index improver, the engine oil compound, the emulsifier, and the base oil are added to a blending kettle in the order of the components, the temperature is controlled to be 55°C-65°C, and the components are stirred for 1h-2h until they are evenly mixed, and then the product can be obtained by filtering while hot and cooling to room temperature. According to the method of the embodiment of the present invention, an engine oil composition with excellent emulsification and anti-icing properties can be prepared.

[0069] According to an embodiment of the present invention, the weight ratio of the dispersible pour point depressant, the viscosity index improver, the engine oil compound, the co-emulsifier, and the base oil is (7-13):(1-10):(0.2-0.8):(0.2-0.8):(75.4-91.6).

[0070] engine

[0071] In a third aspect of the present invention, the present invention provides an engine. According to an embodiment of the present invention, the engine comprises: the engine oil composition according to the first aspect of the present invention. The engine according to the embodiment of the present invention has excellent anti-icing performance.

[0072] car

[0073] In a fourth aspect of the present invention, the present invention provides an automobile. According to an embodiment of the present invention, the automobile comprises: the engine oil composition according to the first aspect of the present invention. The automobile according to the embodiment of the present invention has excellent anti-icing performance.

[0074] The scheme of the present invention will be explained below in conjunction with the embodiments. It will be appreciated by those skilled in the art that the following embodiments are only used to illustrate the present invention and should not be considered as limiting the scope of the present invention. Where specific techniques or conditions are not indicated in the embodiments, the techniques or conditions described in the literature in this area or the product specifications are used. The reagents or instruments used are not indicated by the manufacturer and are all conventional products that can be obtained commercially.

[0075] Embodiments 1 to 8:

[0076] According to the weight parts in Table 1 below, a total of 100, weigh the dispersible pour point depressant, viscosity index improver, engine oil compound, emulsifier, and base oil respectively, heat and stir at 55-65° C. for 1 h-2 h until completely uniform, filter while hot and cool to room temperature to obtain the corresponding products S1-S8.

[0077] Table 1

[0078]

[0079]

[0080] Comparative Examples 1 to 4:

[0081] According to the weight parts in Table 2 below, a total of 100, weigh the non-dispersible pour point depressant, dispersible pour point depressant, viscosity index improver, engine oil compound, emulsifier, and base oil respectively, heat and stir at 55-65° C. for 1 h-2 h until completely uniform, filter while hot and cool to room temperature to obtain the corresponding products DS1-DS4.

[0082] Table 2

[0083] DS1 DS2 DS3 DS4 Engine oil package 8.3 8.3 8.3 8.3 Viscosity Index Improver 5 5 5 5 Non-dispersible pour point depressants / / / 0.2 Dispersible Pour Point Depressant / 0.2 / / Emulsifier / / 0.2 / Base oil 86.7 86.5 86.5 86.5

[0084] Comparative Example 5:

[0085] A fully synthetic SP 0W20 engine oil imported from a foreign country, marked as DS5.

[0086] The engine oil compositions prepared in Comparative Examples 1 to 5 and Examples 1 to 8 were subjected to -35°C low temperature dynamic viscosity test, -40°C low temperature pumping viscosity test, pour point test, emulsification retention test, and anti-icing performance test. The standards and methods of each test are as follows:

[0087] -35℃ low temperature dynamic viscosity test: GB / T 6538

[0088] -40℃ low temperature pumping viscosity test: SH / T 0562

[0089] Pour point test: GB / T 3535

[0090] Emulsification retention test: The engine oil compositions prepared in Comparative Examples 1 to 5 and Examples 1 to 8 were respectively mixed with water at a mass ratio of 90:10, and stirred evenly for 1 min using a high-speed stirrer at a stirring rate of 10,000 r / min. After being fully emulsified, they were stored at 25°C for 14 days to observe changes in the emulsification retention performance of the oil products.

[0091] Anti-icing performance test: The engine oil compositions prepared in Comparative Examples 1 to 5 and Examples 1 to 8 were mixed with water and gasoline at a mass ratio of 60:20:20, and stirred at a stirring rate of 10000 r / min for 1 min using a high-speed stirrer. The stirred samples were allowed to stand at 25°C for 3 h, then at -25°C for 24 h, taken out and filtered, and the ice weight was weighed. Ice ratio / wt%=(ice weight / total weight of emulsion) x 100%. The gasoline was commercially available 92# gasoline.

[0092] The test results are shown in Table 3 below:

[0093] Table 3

[0094]

[0095] As can be seen from Table 3, the low-temperature performance results (low-temperature dynamic viscosity, low-temperature pumping viscosity, pour point) of the engine oil compositions prepared in Examples 1 to 8 are generally improved compared with those of Comparative Examples 1 to 5, indicating better low-temperature fluidity.

[0096] Compared with Comparative Examples 1 to 5, Examples 1 to 8 show that the engine oil composition has excellent emulsification retention and can maintain no obvious sedimentation for 14 days. The specific results are as follows: Figure 1 In addition, the freezing rate is lower, and the engine oil will not even freeze, showing excellent anti-icing performance. The engine oil composition provided by the present invention provides better start-stop protection for the engine of new energy hybrid vehicles in low temperature and severe cold environments.

[0097] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0098] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. An engine oil composition, characterized in that: include: Engine oil package; Viscosity index improvers; Dispersible pour point depressants; Emulsifier; Base oil.

2. The engine oil composition according to claim 1, characterized in that The engine oil compound comprises at least one of Afton H11458, Afton H11181, Afton H11410, Infineum P5960 and Infineum P6800.

3. The engine oil composition according to claim 1, characterized in that The viscosity index improver includes at least one of an ethylene propylene copolymer and a hydrogenated styrene diene copolymer.

4. The engine oil composition according to claim 1, characterized in that: The dispersible pour point depressant has a general chemical formula as shown in formula (1): Among them, R1 is C1~C 20 A straight-chain or branched hydrocarbon group, R2 is hydrogen or methyl, Y is a polar group, m is in the range of 1 to 70, n is in the range of 1 to 125, and the molecular weight is 10,000 to 200,000.

5. The engine oil composition according to claim 1, characterized in that: The co-emulsifier has the general chemical formula shown in formula (2): Where R is C 12 ~C 20 A straight-chain or branched hydrocarbon group.

6. The engine oil composition according to claim 1, characterized in that: The base oil includes at least one of a Group III base oil and a Group IV base oil.

7. The engine oil composition according to claim 1, characterized in that: Based on the total weight of the engine oil composition, the engine oil composition comprises: 7-13 parts of engine oil compound; 1 to 10 parts of viscosity index improver; 0.2-0.8 parts of dispersible pour point depressant; 0.2-0.8 parts of auxiliary emulsifier; 75.4 to 91.6 parts of base oil.

8. A method for preparing an engine oil composition, characterized in that: include: The dispersible pour point depressant, the viscosity index improver, the engine oil compound, the co-emulsifier and the base oil are mixed to obtain the engine oil composition.

9. The method according to claim 8, characterized in that The weight ratio of the dispersible pour point depressant, the viscosity index improver, the engine oil compound, the co-emulsifier and the base oil is (7-13):(1-10):(0.2-0.8):(0.2-0.8):(75.4-91.6).

10. An engine, characterized in that: include: The engine oil composition according to any one of claims 1 to 7.

11. A car, characterized in that: include: The engine oil composition according to any one of claims 1 to 7.

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